產(chǎn)品詳情
現(xiàn)貨供應(yīng)原包POM Tarnob 300 EC1
page 1 of 2 MATERIAL DATA SHEET LG/ 02.2010 EDITION 6 TARNOFORM? 300 PROPERTIES STANDARD ISO 11357-1-3 1183 1133 1133 62 62 294-4 527-1,-2 527-1,-2 527-1,-2 527-1,-2 178 178 179-1 179-1 179-1 179-1 180 2039-1 306 75-1,-2 11359-1/-2 IEC 60216 UL94 US-FMVSS 302 IEC 60093 IEC 60093 IEC 60243-1 IEC 60250 IEC 60250 IEC 60112 TEST CONDITIONS 10°C/min. 190°C/2,16kg 190°C/2,16kg 23°C/50%RH 23°C/sat. 60x60x2 50mm/min 50mm/min 50mm/min 1mm/min 2mm/min 2mm/min 1eU 1eU 1eA 1eA 358 N 50N 1,8 MPa 23°C - 55°C 20000 h 5000 h 3,2 mm thickness d≥1mm 2mm 1MHz 1MHz solution A UNIT TYPICAL DATA PHYSICAL Melting point; DSC Density Melt volume-flow rate (MVR) Melt mass-flow rate (MFR) Humidity absorption Water absorption Linear shrinkage II MECHANICAL Tensile strength at yield Elongation at yield Elongation at break Tensile E-modulus Flexural strength Flexural modulus Charpy impact strength Charpy impact strength (-30°C) Charpy notched impact strength Charpy notched impact strength (-30°C) Izod notched impact strength Ball indentation hardness THERMAL Vicat softening point Heat deflection temperature Coefficient of linear thermal expansion II Temperature index TI Limit of temperature, at few hours operation FLAMMABILITY Flammability Burning Rate ELECTRICAL Surface resistivity Volume resistivity Dielectric strength Dielectric constant Dissipation factor Comparative tracking index CTI ? ?xcm kV/mm V 10 15 10 25 3,8 600 14 °C 3 g/cm 3 cm /10min g/10min % % % MPa % % MPa MPa MPa 2 kJ/m 2 kJ/m 2 kJ/m 2 kJ/m 2 kJ/m MPa °C °C E-4/°C °C °C °C Class mm/min 167 1,41 8 9 0,2 0,8 2,0 62 10 50 2800 64 2500 200 180 6 5,5 6 145 150 115 1,1 100 HB <100 Product nomenclature acc. ISO 9988-1: POM-K, M-GNR, 03-002 All data for natural and black coloured material (unless indicated otherwise). Properties measured at 23°C (unless indicated otherwise). \ page 2 of 2 TARNOFORM? 300 CHARACTERISTICS Tarnob? 300 - is the standard, fast cycling injection-moulding grade, good chemical resistance, exhibit low mould deposit. Destined for injection moulding for production of parts used in automotive, machine parts, appliances, household articles, electronic, building and furnishes industries, etc. Melt temperature: 170-230°C, Injection pressure: 60-120 MPa, Injection speed: slow - medium Mould temperature: 60-120°C, optimum about 90°C, for precision parts up to 120°C Tarnob? 300 is delivered as ready for processing, without need of drying. If product has been exposed to a damp atmosphere or has been in contact with water, it has to be dried at 100° C to 120° C in circulating air oven for about 2- 4 hours. Processing moisture content should be : < 0,10 %, Standards colours: natural, black, other colours on request. APLICATIONS PROCESSING DRYING COLOUR RECYCLING Clean, milled, not contained degradated polymer, postproduction wastes could be reused after mixing with fresh plastic. The addition level of milled scraps may reach up to 10%. It is recommended to use pre-dry milled scraps. Available in PE bags containing 25 kg of granules and next put to 1000 kg pallets Available in octabins (big-bag containers) containing up to 1000 kg of granules PACKAGING 補(bǔ)牙時，牙齒材料到底發(fā)生了什么變化？
我們補(bǔ)牙時所用的材料有樹脂的，有銀汞合金的，這是目前使用最為廣泛的兩種牙齒修補(bǔ)材料。此次我們就來詳細(xì)說說這兩種材料。
一、樹脂材料
樹脂，廣義上其實(shí)就是塑料。樹脂材料補(bǔ)牙，說白了就是在你的牙里做一個化學(xué)反應(yīng)，反應(yīng)類型是聚合反應(yīng)。其中牙洞是反應(yīng)容器，補(bǔ)牙樹脂原材料的主要成分是單體（次要成分是光引發(fā)劑、無機(jī)添加劑等），產(chǎn)生的固體是產(chǎn)物聚合物。
1. 單體
目前牙科材料的單體結(jié)構(gòu)包括但不限于如下結(jié)構(gòu)：
其實(shí)就是雙甲基丙烯酸酯結(jié)構(gòu)了，用于聚合的就是那兩個雙鍵官能團(tuán)（術(shù)語叫雙官能度單體）。
2. 聚合
機(jī)理：自由基聚合，總體來說聚合分為：引發(fā)、增長、終止三個過程。
引發(fā)：就是讓體系中產(chǎn)生自由基，補(bǔ)牙樹脂中含有少量的引發(fā)劑成分，目前主要就是用樟腦醌加上胺類物質(zhì)。在正常情況下，這些光引發(fā)劑很穩(wěn)定，但在光照情況下，這些引發(fā)劑會迅速發(fā)生變化產(chǎn)生自由基，自由基引發(fā)單體進(jìn)行聚合。這下大家明白補(bǔ)牙時候?yàn)槭裁瘁t(yī)生要拿一個紫光燈去照射牙齒了吧。
增長：就是聚合反應(yīng)持續(xù)進(jìn)行，單體轉(zhuǎn)化率、聚合度持續(xù)增加。我們上述已經(jīng)介紹過，單體都是雙官能度的，不可避免發(fā)生分子間的交聯(lián)反應(yīng)，體系從粘稠的單體變?yōu)閺椥缘哪z體，這時候發(fā)生的是凝膠化，聚合度進(jìn)一步增加，就變成硬性的固體，這時候發(fā)生的是玻璃化。整個的這樣的過程就是“變硬”。
終止：就是在聚合反應(yīng)后期，由于單體已經(jīng)消耗差不多了，或者是由于體系的固化程度已經(jīng)很高，殘存的單體已經(jīng)游不動了，自由基便通過偶合終止或者歧化終止被反應(yīng)掉，當(dāng)然不排除有些自由基在無氧無水的微環(huán)境中會長期存留。
二、銀汞合金材料
銀汞實(shí)際上是一種合金。聽名字你就明白了，汞是其中的一種成分。那么，這種補(bǔ)牙材料對人體是否有毒性呢？其實(shí)不用擔(dān)心，雖然汞本身是有毒的，但是做成合金后的泄漏量小的可憐。并且在人群中廣泛使用之前已經(jīng)進(jìn)行過充分的論證與毒性評估。但是目前來講，銀汞合金補(bǔ)牙材料已經(jīng)逐步淘汰，主要是基于以下原因：
顏色不好看，非常影響美觀。
沒有粘結(jié)性。
金屬與牙齒的導(dǎo)熱性差別較大，導(dǎo)致牙齒敏感。
參考資料：
1. Stansbury, J. W., Curing dental resins and composites byphotopolymerization. Journal of Esthetic & Restorative Dentistry 2000,12 (6), 300–308.
2. Peutzfeldt, A., Resin composites in dentistry: the monomer systems. European Journal of Oral Sciences 1997, 105 (2), 97–116.
3.Moszner, N.; Salz, U., New developments of polymeric dental composites. Progress in Polymer Science 2001, 26 (4), 535-576.
4. Leprince, J. G.; Palin, W. M.; Hadis, M. A.; Devaux, J.; Leloup, G.,Progress in dimethacrylate-based dental composite technology and curingefficiency. Dental Materials 2013, 29 (2), 139-156.
